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AP1184K518L-U Datasheet(PDF) 7 Page - Diodes Incorporated

Part # AP1184K518L-U
Description  4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP1184K518L-U Datasheet(HTML) 7 Page - Diodes Incorporated

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AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
AP1184 Rev. 4
7 of 12
MARCH 2008
www.diodes.com
© Diodes Incorporated
Functional Descriptions
( Continued )
Assuming, the following conditions:
Vout = 2.5V
Vin = 3.3V
Vctrl = 5V
Iout = 2A DC Avg.
Calculate the maximum power dissipation using the following equation:
Pd = Iout * ( Vin - Vout) + ( Iout /60) * ( Vctrl - Vout )
Pd = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W
Using table below select the proper package and the amount of copper board needed.
Package
Copper Area
θ
JA (
oC/W)
Max Pd (TA = 25
oC)
Max Pd (TA = 45
oC)
TO263-5L
Pad Size-1.4”X1.4”
25-45
2.4W-4.4W
2.0W-3.6W
Notes:
6. Above table is based on the maximum junction temperature of 135
oC.
As shown in the above table, any of the two packages will do the job.


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